Safety hook-off device for wells



Nov. 16 1926.

E. HENSLEY SAFETY HOOK-OFF DEVICE FOR WELLS Filed June 11. 1926 ETHen 626 y MENTOR.

WITNESS:

' 25 struction and arrange Patented Nov. 16!, 1926. v

UNITED STATES nu mam-1!, prtrunsg oxmnom, assrenon or own-Hm To nnunn'wnnn, or

worse, onanomai SAFETY HOOK-9F! a nnvrcn Ion WELL Application filed June 11, 1926. Serial No. 115,347.

The object of this invention is to provide means for connecting and disconnectmg the main driving mechanism with the pumping 77 means for individual oil wells, the o eration being known as hooking on and hoo 'ngolf the well while the main power operated devices continue in operation.

A further object is to provide means including a rack element and a plurality of W specially mounted pawls, one of which automatical y releases the other, so that when the 1power element is connected, :1. locking paw is automatically disengaged forretainmg the pumping apparatus of that particul5 lar well moperative.

A'further object is to provide, in connection with relatively slidable elements,a plurality of pawls, one of which constitutes anen g element, and the other a disengagin e ement, the pawls having the. particular re ation specified in the operation oi the de- V108. With the foregoing and other objects in view, the invention consists in the novel conment of elements described, illustrated and claimed, it being understood that modifications may be made withinthe sco of the claims, without de ar'ting from e spirit of the invention.

' p In the drawings forming part of this application, 1 1

Figure 1 shows the construction in long1-, tudinal section, with parts in elevation, and parts in dotted lines 35' Figure 2 is a section on line 2 2 of Figure 1. r Figure 3 isa section on line 3-3 of Fig- Figure 4 is a perspective view of one of 40 the pawls detached from the mounting.

In Figure 1, the power end of the device is at the [left and the ick-up connections are a the right, the bite rod being conby means shown conventionally at 11, 45 with tubular element 12 constituting a hous- The" pick-up connections shown conventionally at the right, are designated 14, and a rack bar 15 is connected with one of the. elements of the pick-up device, in the 50 manner'shownat 16, where ahead'is provided for engagement with element 17. Asuming that a number of oil. wells are to be operated from a centrally located power plant,- and the individual pum ing apparatus for the several wells are to ave power applied thereto thru liitch rod 10, it

will be observed that the tubular element 12 will constantly be'in operation, and the objectv of this device is to provide particular means for coupling bar 15 to tubular element 12, whenfthe individual well is to be H placed'in operation, and to provide a hook- 1 off device by means of which bar 15 is held '{ina stationary position while the individual well is not in operation, the retaining means ibeing disengaged automatically when the \paw mounted on an element'connected with tubular member 12, is engaged. Figure 3 shows the construction of a pawl ountingdevice, comprising a plurality of members 18 and 19 connected by bolts 20, these elements '18 and 19 providing an interfor receiving the pawls 21.

The pawls 21 each include a cutaway portlon 22 providing angular portions 23 and mediate chamber or the like designated 24 and beveled surfaces for contact with the 1 teeth- 27, of rack member 15.- The pawls further include knobs or operating devices 28, and" each pawl is under the influence of a ring 29 mounted as shown. For-convemence the awl at the left in Figure 1 constituting te hook-on, pawl is designated 21 as indicated, and the other pawl constitutmg the hook-ofl device, is designated 21,

these elements being illustrated in full line and in dotted line position, and the pawl 21' being e'ngaged'in Figure 1 the other pawl being dise ged. The moiinting device of the right hand pawl, one element of whichis.

designated 19, carries an end member 30 connected with a stationary arm 31 the connection being effected by bolts 32, and when the pawl 21' is engaged with the rack memher- 15, the latter is held inoperative and the indlvidual well is temporarily disconnected from the main, pumping apparatus. The mountin' means for pawl 21 is connected with the ousin ortubularelement 12, constituting a driving member, in the manner loo . able manner asby ribs 21 operating in grooves inelements 18 and 19.

hair 15, incident to the drive will release the other pawl on account of the direction in which the teeth engage, and this pawl 21 is then freed by its spring 29 (The pull on bar 15, toward the right, due to the Weight of the apparatus in the well, held pawl 21' in operative position when there was no thrust being imparted thru tubular member 12.)

Having thus described the invention, what is claimed is:

1. A device of the class described, comprising relatively slidable elements, one of which is provided with teeth, pawl mounting devices having longitudinal openings receiving respectively the elements first named,

paw-ls within the mounting devices and connected therewith, one of the mounting devices being connected with one of said elementsfirst named, the pawls being adapted to engage the teeth of the other of said elements,

toothed element with pumping devices, pawl.

mounting devices having longitudinal openings receiving respectively the elements first named, pawls within the mounting devices and connected therewith, one of the mounting devices being connected with one of the elements first named, the pawls'being adapted to engage the teeth of the other of said elements, and one of the pawls when engaged acting thru the toothed element to release the other pawl.

In testimony whereof I atlix my signature. v

ELI HENSLEY. 

